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View Poll Results: how do you start your sprinter?
wait for dash lights to turn off before cranking 60 78.95%
do not wait for dash lights to turn off before cranking 16 21.05%
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Old 01-10-2020, 03:32 AM   #61
Gabe Athouse
 
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Default Re: How do you start your Sprinter?

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Originally Posted by 4wheeldog View Post
125 AMPS? Really? That sounds like a lot. Watts would sound more likely.
Because 125 amps plus what the starter draws......It is a wonder that these things start at all, after two weeks.
But it does justify my either using a battery charger before starting, or jumping with the house battery, when it has been sitting and it is cold.
Definitely amps, and not surprising, there are 6 of them so thatís only 21a each. Yep, in fords itís a common problem to have damage to ecu from low voltage at start up, and that engine has 2 large batteries in parallel to start, like most diesels. Those guys change batteries every other year regardless of condition or symptom.
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Old 01-10-2020, 06:25 PM   #62
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Default Re: How do you start your Sprinter?

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Originally Posted by 4wheeldog View Post
...
Because 125 amps plus what the starter draws......It is a wonder that these things start at all, after two weeks.
...
That is a reasonable initial load number, but it tapers off pretty quickly during the GP pre-start cycle. The initial load is high until the control winding (T1N design) heats up, or other control reduces the amperage. By the time the GP cycle times out and signal ok to crank, the load is no longer 125 amps.

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Old 01-10-2020, 10:22 PM   #63
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Default Re: How do you start your Sprinter?

Yes and since the taper amps are down to around 20 for several minutes my suspicion is that it’s cycling full 20a but only on one plug at a time, where the initial amps is all at once full on. This is why the plugs can burn out when the controller gets funky, because it can burn them out very easily.
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Old 01-17-2020, 05:26 PM   #64
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Default Re: How do you start your Sprinter?

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Originally Posted by Gabe Athouse View Post
Yes and since the taper amps are down to around 20 for several minutes my suspicion is that itís cycling full 20a but only on one plug at a time, where the initial amps is all at once full on. This is why the plugs can burn out when the controller gets funky, because it can burn them out very easily.
Are these amp readings taken at the 12vdc source to the GPM, or at the lower (4.4?volt) downstream of the module?
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